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What is a good free linux server monitor package that has a web gui?

I have multiple servers co-lo and I want to setup an additional screen for monitoring their up-time, services, memory, drive space, bandwidth...etc. If possible all on one screen if possible. Just wondering what other admins like to use for this.

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1. The most popular and probably industry standard one is Nagios Beats other software in this category hands down. Also check out RRD tool and Cactii